Numeric Power Systems Limited manufactures Energy Efficient Inverters with Automatic line-to-battery switchover. Numeric Power Systems Limited plant at Pondicherry has ISO 9001:2000 accredit UPS manufacturing facility in India. Energy Efficient Inverters with Automatic line-to-battery switchover converts DC power to clean modified sine wave AC power that is ideal for residential and office appliances. It has a microprocessor based design and features over load protection, Short circuit protection, intelligent Two-stage charger and compact rack tower design.